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  1. #1
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    Default Homemade carb sync tool

    Founf this on my journeys through the intraweb. For $2 it's better than the expensive kits.

    http://www.650ccnd.com/mano.htm

  2. #2
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    Quote Originally Posted by shvlpnchr79 View Post
    Founf this on my journeys through the intraweb. For $2 it's better than the expensive kits.

    http://www.650ccnd.com/mano.htm
    yep yep me and my buddy made that same one. works like a charm.

  3. #3
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    I've been thinking about building one. For a 4 cyl bike, would I sync carbs 1/4 and 2/3? My bike shares coils for 1/4 and 2/3, so I'm assuming that'd be the correct pairing.

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    Great tool

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    Quote Originally Posted by Pendulum View Post
    I've been thinking about building one. For a 4 cyl bike, would I sync carbs 1/4 and 2/3? My bike shares coils for 1/4 and 2/3, so I'm assuming that'd be the correct pairing.
    Sync all 4!

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    Quote Originally Posted by coma13 View Post
    Sync all 4!
    The home made tool they're using only has 2 hoses. I know once I get each pair close that I'd want to sync all 4, but I was just wondering if I can use the 2 hose setup for 4 carbs.

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    Quote Originally Posted by Pendulum View Post
    The home made tool they're using only has 2 hoses. I know once I get each pair close that I'd want to sync all 4, but I was just wondering if I can use the 2 hose setup for 4 carbs.
    I guess you could built two and watch them both. I was wondering the same thing about four cyls.

  8. #8
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    You can sync 2 and 2, then sync 2 pairs with each other.

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    This is one of those cheap little tools that worth they're weight in gold.

  10. #10
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    use a 1/4" Cross Fitting for a four cylinder and a 2x2 piece of wood to old it all
    Attached Thumbnails Attached Thumbnails 14c.gif  

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    Built one for my KZ550 by using some hardware store tubing, couple of tee fittings, zipties, 2 stroke oil, and a scrap of plywood I had sitting around. Worked out nicely as the oil really jumps a lot for small adjustments. Probable should give it another check when I get the KZ out this spring. Hardest thing was loading up the oil. I used a tiny 30ml syringe my wife had used to feed some baby kittens she was nursing back to health, worked but took a while to get enough oil moved.


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    I made the one like in the original post for my V star, works great!

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    Thats badass, im going to make me one of those as i need to sync the carbs on my KZ. Thanks for the post!

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    How exactley does this thing work?

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    put some old jets in the lines and it'll take some of jump outta that oil. Obviously. make sure you use the same size in each line,

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    Quote Originally Posted by Steamboat View Post
    How exactley does this thing work?
    you connect it to the carbs and both carbs start sucking on the lines, creating a vacuum which will raise the oil level on the according side. if the carbs are synced, the vacuum on both sies of the tool is equally strong and the oil level is the same in both tubing.
    like a tug of war.
    sorry for my bad english.

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    Quote Originally Posted by MitchMotors View Post
    you connect it to the carbs and both carbs start sucking on the lines, creating a vacuum which will raise the oil level on the according side. if the carbs are synced, the vacuum on both sies of the tool is equally strong and the oil level is the same in both tubing.
    like a tug of war.
    sorry for my bad english.
    Your english is fine. So basically your saying that as the pistons suck air, the fluid in the tube connected to that cylinder will pull the oil up? I'm assuming your talking about disconnecting the fuel lines running into the carb and plugging this tool into it?

  18. #18
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    Quote Originally Posted by Steamboat View Post
    Your english is fine. So basically your saying that as the pistons suck air, the fluid in the tube connected to that cylinder will pull the oil up? I'm assuming your talking about disconnecting the fuel lines running into the carb and plugging this tool into it?
    NO!!! DON'T do that!!

    If your carbs are set up with sync ports they can be found on the rubber boot connecting the carb to the motor. It will be a small vacuum nipple with a rubber cap on it. This is where you hook up your sync tool lines.
    The tool will then 'sense' that both carbs are opening at precisely the same moment; feeding a air/fuel mix to the cylinders at the same time. If one carb is opening a little faster, the oil in the corresponding line on your tool will begin to rise up. You will then find your adjustment screw and mess with that until the oil in the lines balance or are pretty close. The manual for your bike should reference this procedure. Hit me up or some of the folks on here if you have more questions. Maybe someone on here will chime in regarding your particular bike and model.
    Last edited by steves7220; 02-12-2012 at 4:23 PM.

  19. #19
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    Quote Originally Posted by steves7220 View Post
    NO!!! DON'T do that!!
    Ahhh...I didn't know these sync ports existed. I got the bike as a basket case and am totally ignorant. Thanks for the info man!!

  20. #20
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    Quote Originally Posted by forty4ma9 View Post
    Built one for my KZ550 by using some hardware store tubing, couple of tee fittings, zipties, 2 stroke oil, and a scrap of plywood I had sitting around. Worked out nicely as the oil really jumps a lot for small adjustments. Probable should give it another check when I get the KZ out this spring. Hardest thing was loading up the oil. I used a tiny 30ml syringe my wife had used to feed some baby kittens she was nursing back to health, worked but took a while to get enough oil moved.
    lol... your gonna love what i did. I stuck one of the hoses in the jug of oil and i sucked it into the tube... I then took my house off my mounted platform, went into the street... and i swung it in a circle over my head which forced the fluid away from the openings. I remounted it and all the fluid is nicely in No complex filling.

    On my XS though the jump between cylinders was pretty dramatic, i didnt think about installing a jet, thats a good idea! Just too much flow between the two and i end up sucking up the fluid. I used ATF as its bright and red, and easy to see.

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